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Proceedings Paper

Optical fiber polarimetric sensor for measurement of load
Author(s): Ricardo E. Medrano; R. Barreto da Silva
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Paper Abstract

The optical fiber birefringence is modified by application of stress over the fiber. This characteristic is used in load cell development, using the polarimetric technique. A test sample is developed embedding the optical fiber in epoxy resin. This resin presents a high elastic module and permits a good transference of the stress acting on the resin to the optical fiber. The sensor consists of a polarized Ga-As laser coupled to a single-mode optical fiber of medium birefringence. A germanium device detects the signal variation imposed by the stress application. The output of this device (intensity of light as a function of load) is a quadratic sinusoidal curve. The theoretical stress acting on the fiber as a function of load was calculated by finite element method and by elasticity solutions of compose materials. Measurement of increase in load that corresponds to a period of the quadratic sinusoidal curve was used to compare phase change analysis based in birefringence theory with mechanical methods to calculate the relation between the applied stress and the stress acting on the optical fiber.

Paper Details

Date Published: 22 June 2004
PDF: 9 pages
Proc. SPIE 5503, Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 June 2004); doi: 10.1117/12.579534
Show Author Affiliations
Ricardo E. Medrano, Univ. Estadual de Campinas (Brazil)
R. Barreto da Silva, Univ. do Vale do Paraiba (Brazil)

Published in SPIE Proceedings Vol. 5503:
Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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